#!/bin/bash
set -e
project_dir=$PWD
cache_dir=${LINGLONG_FETCH_CACHE:-$PWD/linglong/cache}
mkdir -p "$cache_dir"
# 文件名 deb-source.bash
# 包含要解压的deb目录
deb_dir=$(realpath "$1")
# 将deb解压到输出目录
target=$(realpath "$2")
# 默认会跳过base已安装的包，可以强制解压已安装的包
include="$3"
# 临时目录，将内容处理后再移动到 target
out_dir="$(mktemp -d)"
cd "$out_dir"
# 临时文件，用于记录deb文件列表
deb_list_file="$out_dir/deb.list"
# 临时文件，用于记录强制安装的包名
include_list_file="$out_dir/include.packages.list"
# 临时文件，用于记录跳过安装的包名
exclude_list_file="$out_dir/exclude.packages.list"
# 包数据存放的临时目录
data_list_dir="$out_dir/data"
# 生成文件列表
find "$deb_dir" -type f -name "*.deb" >"$deb_list_file"
echo "$include" | tr ',' '\n' >"$include_list_file"
# 用于记录安装的所有文件来自哪个包
mkdir /tmp/deb-source-file || true

# 如果base和runtime已安装则跳过，旧版本base没有/packages.list文件就使用/var/lib/dpkg/status
grep 'Package: ' /var/lib/dpkg/status >"$exclude_list_file" || true
# 跳过base和runtime已安装的包，也可使用install_dep_skip.list文件控制跳过哪些包
cat /packages.list /runtime/packages.list "$PREFIX/packages.list" "$project_dir/install_dep_skip.list" >>"$exclude_list_file" || true

# 遍历文件列表
while IFS= read -r deb_file; do
    # 输出deb名，但不换行，便于在包名后面加skip
    echo -n "Extracting $deb_file"
    # 提取control文件
    control_file=$(ar -t "$deb_file" | grep control.tar)
    ar -x "$deb_file" "$control_file"
    # 获取包名
    pkg=$(tar -xf "$control_file" ./control -O | grep '^Package:' | awk '{print $2}')
    version=$(tar -xf "$control_file" ./control -O | grep '^Version:' | awk '{print $2}')
    rm "$control_file"
    # 如果在base和runtime中已安装，并且不包含在include（强制安装）列表则跳过安装，否则安装到$PREFIX目录
    if grep -q "^Package: $pkg$" "$exclude_list_file" && ! grep -q "^$pkg$" "$include_list_file"; then
        echo " skip"
        echo "$deb_file" >>/tmp/deb-source-file/skip.list
        continue
    fi
    # 记录到 packages.list
    echo "Package: $pkg $version" >>"$PREFIX/packages.list"
    # 换行
    echo ""
    # 缓存解压后的data.tar文件，便于在下次使用时，加快安装速度
    deb_sha=$(sha256sum "$deb_file" | awk '{print $1}')
    data_cache="$cache_dir/install_dep_$deb_sha"
    if [ ! -e "$data_cache" ]; then
        data_cache_tmp="$cache_dir/install_dep_tmp_$deb_sha"
        # 查找data.tar文件，文件会因为压缩格式不同，有不同的后缀，例如data.tar.xz、data.tar.gz
        data_file=$(ar -t "$deb_file" | grep data.tar)
        case "$data_file" in
        *.xz) ar -p "$deb_file" "$data_file" | unxz >"$data_cache_tmp" ;;
        *.gz) ar -p "$deb_file" "$data_file" | gunzip >"$data_cache_tmp" ;;
        *.zst) ar -p "$deb_file" "$data_file" | unzstd >"$data_cache_tmp" ;;
        *)
            echo "unknown file type"
            exit 1
            ;;
        esac
        mv "$data_cache_tmp" "$data_cache"
    fi
    # 解压data.tar文件到输出目录
    mkdir "$data_list_dir"
    tar -xvf "$data_cache" -C "$data_list_dir" >>"/tmp/deb-source-file/$(basename "$deb_file").list"
    # 清理不需要复制的目录
    rm -r "${data_list_dir:?}/usr/share/applications"* 2>/dev/null || true
    # 修改pc文件的prefix
    sed -i "s#/usr#$PREFIX#g" "$data_list_dir"/usr/lib/"$TRIPLET"/pkgconfig/*.pc 2>/dev/null || true
    sed -i "s#/usr#$PREFIX#g" "$data_list_dir"/usr/share/pkgconfig/*.pc 2>/dev/null || true
    # 修改指向/lib的绝对路径的软链接
    find "$data_list_dir" -type l | while IFS= read -r file; do
        linkTarget=$(readlink "$file")
        # 如果指向的路径以/lib开头，并且文件不存在，则添加 /runtime 前缀
        # 部分 dev 包会创建 so 文件的绝对链接指向 /lib 目录下
        if echo "$linkTarget" | grep -q ^/lib && ! [ -f "$linkTarget" ]; then
            ln -sf "$target$linkTarget" "$file"
            echo "    FIX LINK" "$linkTarget" "=>" "$target$linkTarget"
        fi
    done

    # 修复动态库的RUNPATH
    find "$data_list_dir" -type f | while IFS= read -r file; do
        fileinfo=$(file "$file")
        # skip non-dynamic librarie
        if ! echo "$fileinfo" | grep -q 'shared object'; then
            continue
        fi
        # skip debug file
        if echo "$fileinfo" | grep -q 'with debug_info'; then
            continue
        fi
        runpath=$(readelf -d "$file" | grep RUNPATH | awk '{print $NF}')
        # skip without runpath
        if ! echo "$runpath" | grep -q '^\[/'; then
            continue
        fi
        # 如果RUNPATH使用绝对路径，则添加/runtime前缀
        runpath=${runpath#[}
        runpath=${runpath%]}
        newRunpath=${runpath//usr\/lib/runtime\/lib}
        newRunpath=${newRunpath//usr/runtime}
        patchelf --set-rpath "$newRunpath" "$file"
        echo "    FIX RUNPATH" "$file" "$runpath" "=>" "$newRunpath"
    done
    # 复制/lib,/bin,/usr目录
    cp -rP "$data_list_dir/lib" "$target" 2>/dev/null || true
    cp -rP "$data_list_dir/bin" "$target" 2>/dev/null || true
    rm -r "${data_list_dir:?}/usr/share/systemd" 2>/dev/null || true
    rm -r "${data_list_dir:?}/usr/lib/systemd" 2>/dev/null || true
    cp -rP "$data_list_dir"/usr/* "$target" || true
    rm -r "$data_list_dir"
done <"$deb_list_file"

# 修复相对路径的软链接(dev包内的软连接尝试修复指向base)
find "$target/lib" -type l | while IFS= read -r file; do
    # 获取链接的绝对路径
    linkTarget=$(readlink -m "$file")
    # 只处理无效软链接
    if [ -e "$linkTarget" ]; then
        continue
    fi
    # 查看/usr/lib下是否存在
    baseLinkTarget="/usr${linkTarget#$target}"
    if [ -e "$baseLinkTarget" ]; then
        ln -sf "$baseLinkTarget" "$file"
        echo "    FIX LINK" "$file" "=>" "$baseLinkTarget"
        continue
    fi
    # 查看/lib下是否存在
    baseLinkTarget="${linkTarget#$target}"
    if [ -e "$baseLinkTarget" ]; then
        ln -sf "$baseLinkTarget" "$file"
        echo "    FIX LINK" "$file" "=>" "$baseLinkTarget"
        continue
    fi
    echo "  $file -> $linkTarget" >> "$out_dir/invalid_link"
done

if [ -s "$out_dir/invalid_link" ]; then
    echo "Warning: Invalid symbolic link"
    cat "$out_dir/invalid_link"
fi
# 更新ld.so.cache
if [ -n "$LINGLONG_LD_SO_CACHE" ]; then
    ldconfig -C "$LINGLONG_LD_SO_CACHE"
fi

# 清理临时目录
rm -r "$out_dir"
